If its a limit switch push the plunger to see if its sticky (clean with WD40 if necessary). Inspect and clean Limit switch or Prox/decel dog and area around the decel dog of any chips. Keep in mind if you move switch or dog your zero return position will change and you may need to do a gridshift. Troubleshooting the different axis zero return types With Decel switches (switched):Ĭheck that it is hitting the decel dog properly. If No you have absolute encoders no decel switches. Do the axes decelerate in the end when you zero return this machine? If Yes you have zero return decel switches. How to determine what type of zero return type you have?Īfter initial power up. One revolution pulse on the encoder happens to be really close to the drop off point of the decel dog(Switched machines only) Zero return switch(switched machines only)- If Limit switch-does it move freely (clean it) If prox switch, then wipe chips off Faceīackup Battery needs replacement keeps encoder position when power is shut off (Warning Most machines require replacement with power up) What causes zero return position to change or loss of it on any CNC?Ĭrash- causes motor coupling to slip or drive miscalculate positionĬhips piled in area of deceleration dog (switched machines only) Zero return problems alarms and troubleshooting CNC information
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